Intaglio printing machine



June 9, 1931.

K. ALBRECHT INIAGLIO PRINTING MACHINE 3 Sheets-Sheet 1 Filed Dec.

M w @HHHM June 9, 1931. K. ALBRECHT 1,809,466

INTAGLIO PRINTING MACHINE Filed Dec. 3. 1928 5 Sheets-Sheet 2 i lqi KY Q /AYec/ZY J 9, 1931. K. ALBRECHT INTAGLIO PRINTING MACHINE Filed Dec. 3, 1928 5-Sheets-Sheet 3 Patented June 9, 1931 UNITED STATES PATENT OFFICE.

KARIT OF GEISENHEIZM-ON-THE-RHINE, GERMANY, ASSIGNOR TO MAS- C'HINENFAIBRIK J' OHANNISBEBG, G. GERMANY INTAGLIO PRINTING KACHINE Application filedDecember 3,1928, Serial No.

i 6 ing easily and conveniently removed. The

. cylinders are removed in various ways. WVhen copper tubes are used, the iron core of the printing cylinder remains in the machine and the tube is pushed in its axialjdirection 1 through an opening in the frame end. This opening in the frame end is produced by removing one of thehearings in which the printing cylinder runs. .For'retouching and altering the etched surface, it is, however, desirable to be able to roll the printing cylinder out of the machine, that is to move 1t out of the machine at right angles to its.

. axis.

hen solid iron cores covered with an electrically deposited copper layer are used as printing cylin'ders,the whole printing cylinder has t be removed from the machine.v

The movem$nt of the printing cylinder is in this case also at right angles to its axis. In order to enable this to be efi'ected, the frame end has been made open at one side, that is has a ap in it, so that it has the form of an open racket. Wlien heavy pressures occur between the printing cylinder and the impression cylinder, more particularly at the ,beginning and end of the printing operation,

the frame tends to bend apart or even to break, so that it is necessary to make the frame extremely strong, which is however not always possible for constructional rea sons and for the rest considerably increases the cost and the Weight of the machine.

The present inventionovercomes these disadvantages and makes it-possible both to remove the printing cylinder from the ma-. chine at right angles to its axis and the copper tubesupported by'it parallel to its axis. This is efi'ected by both bearing housings for the printing cylinder being made capable of being lowered, one of them being provided in a known manner with an opening for the passage of the copper tube, the machine framev beingconstrncted as a closed frame having the wall recessed back at one place, such that the printing cylinder can be moved as a whole 323,430; and in Germany December 8, 1927.

out of the'machine also at right angles to its axis. Separate guiding rails capable of being inserted are preferably provided, on

which foreffectingthis motion the printing cylinder can be rolled with its journals.

In the accompanying drawings a constructional example of'the invention is shown,

Fig. 1 being a side elevation of the machine frame of an intaglio printing machine with the printing cylinder in the printing position,

Fig. 2 a similar side elevation to Fig. 1, showing the bearing housings of the printing cylinder in the lowered position,

Fig. 3 a part longitudinal section through M. B. H., OF GEISENHEIM-ON- THE-RHIHE,

the machine frame and the bearing, showlng the printing cylinder being withdrawn .in the direction of its axis and Fig. 4 a section on line 4-4 of Fig. 1. Figure 5 is ,a side elevation similar to Figures 1 and 2 showing the printing cylin der being withdrawn on rails in the direction at right angles to its axis.

Figure 6 a cross-section through the frame showing the printing cylinder being Withdrawn'onrails in the direction at right angles to its axis.

Figures 7 and 8 are fragmental views c orresponding'to Figures 1 and 2 but drawn to a larger scale and showing the mechanism v for lowering the bearing housings 0.

be lowered simultaneously in order to enable the printing cylinder ;0 to be withdrawn in the direction at right angles to its axis and the bearing housing of the side Where the machine is attended to is adapted to beslowered separately when the copper tube a is to be drawn out in the direction of its axis. The lowering of the bearing housings c is efl'ected in two stages, the printing cylin'der, being first of all lowered a little automatically in order. to relieve it of the pressure of the impression "cylinder 0, further lowering of the bearing The two bearing housings c are adapted to arm n on a rockshaft q, oscillates the latter,

together with a crank pin 3 mounted on the shaft q. The crank pin y is connected by a link t to a stem 71 of the bearing housing a, 5 said stem having a bearing surface '1: which rests on a journal u of the link t. Thus, when the shaft f is rocked, the bearing housing 0 is raised and lowered slightly. The movement thus effected is very small.

In order to enable the bearing 0 to be lowered into the position shown in Figure 2, the crank pin g. is mounted on a member which is rotatable on the shaft q and is latchable thereto by means of a pawl g which is pivoted on the member and engages a tooth g on a disc h fixed to the shaft g. If the copper tube a is to be taken off, the bearing housing is lowered from the position shown in Figure 1 to that shown in Figure 2 by turning the hand lever l, which is rotatable on the shaft 9, from the position shown in Figure 7 to that shown in Figure 8. This hand lever 1 has pivoted on it a catch at which, in the inoperative position of the lever, is out of engagement with a pin m on the disc in but engages said pin on the lever Z being turned anticlockwise and turns the disc 72. round with it, the tooth g engaging the pawl g and turning the member on which the latter is mounted, thereby moving the crank pin y into the position shown in Figures 2 and 8. By this means the bearing housing a is lowered to such an extent that the copper tube a may be removed axially from the printing cylinder 19. In order to remove the printing cylinder 1) with or without the copper tube a in a direction at right angles to its axis, or to enable the printing cylinder as a whole to be rolled into a position in front of the machine for retouching purposes, two rails b are attached to the side walls 1' and 8 (Figures 5 and 6). Both the bearing casings c of the printing cylinder are then lowered in the manner above described. For this purpose each bearingcasing is provided with hand-operated lowering gear, comprising a lever Z, catch m, disc h and pawl 9. During the lowering of the bearing casings c the printing cylinder p comes to rest on the rails b, in which position the bearings of the printing cylinder are clear of the bearing housings c. The printing cylinder can now be rolled on these rails to the front of the machine and, if required, removed therefrom. The side walls 0 and s have recesses 0: having a depth such that the distance between the bottoms of these recesses will be greater than the length of the printing cylinder 1) and its journals and being of suflicient width to allow the bearings to pass through them. By this means the cylinder is free to roll along the rails as shown in igures 5 and 6. Thus, notwithstanding that the frames are completely closed, it is possible to remove the printing cylinder p from the 55 machine quite readily when required. In

order to enable the bearing casing a to be raised again from the position shown in Figure 8 to that shown in Figure 7, means are provided for withdrawing the pawl g out of engagement with the tooth g and moving its 'tail end (which is also constructed as a pawl) into engagement with a second tooth on the disc 71.. The pawl g is normally urged into engagement with the tooth g by means of a spring, but during the lowering of the bearing casings c a roller 9 on the tail of the pawl g rides on a cam lever is which rocks the pawl g and moves its tail end into engagement with the tooth 9 (see Fig. 8) Thus on the lever 1 being turned clockwise from the position shown in Figure 8, the tooth will engage the tail of the pawl g and will take the member on which the crank pin y is secured round with it and in doing so will raise the bearing housings c. In the inoperative position of the lever Z a catch 1 pivoted in the frame 11, engages the lever and locks it in position, the catch m being held out of engagement with the pin m and at the sametime supporting the lever l as shown in Figure 7.

What I claim is:

1. An intaglio printing machine comprising in combination an impression cylinder, a printing cylinder positioned below the 1mpression cylinder and capable of coacting therewith, bearings for the said cylinders, frame ends for supporting the said bearings and having no free openings therein extending to the sides thereof, means for lowering the printing cylinder hearings in the said frame ends, each frame end having an internal recess extending from the-printing cylinder bearing to the side of the frame end, the machine being adapted to receive means insertable therein for supporting the printing cylinder on the bearings thereof being lowered and guiding the cylinder through the said recesses at right angles to its axis out of the machine, as and for the purposes set forth.

2. An intaglio printing machine comprising in combination an impression cylinder, a printing cylinder positioned below the impression cylinder and capable of coacting therewith, bearings for the said cylinders, frame ends for supporting the said bearings and having no free openings therein extending to the side thereof, means for lowering the printing cylinder hearings in the said frame ends, an internal recess in each frame end extending from the printing cylinder bearing to the side of the frame the machine being adapted to receive rails capable of being inserted in the machine and of acting as runways for rolling the printing cylinder out of themachine through the said recesses at right angles to its axis, as and for the purpose set forth.

In testimonywhereof I have signed my name to this specification.

KARL ALBRECHT. 

